The man has not yet been identified. Sgt. Jonathan Green, an MdTA spokesman, said the man's truck had broken down just south of the Key Highway exit and that the man was struck after he got out of the truck about 11:20 a.m.

Green said the car that struck the man was located, but it was not immediately known whether the car remained at the scene after the crash.

A 31-year-old man who was sentenced to 20 years in prison in Baltimore after he pleaded guilty to possessing 5.9 grams of marijuana won an appeal Wednesday invalidating the plea — raising the possibility that he will be released.